HYDX-6 Plus adopts full hydraulic driving system. The rotation of drill head is driven by variable hydraulic pumps and variable motors with closed loop circuit, set with 2 gear stepless speed adjustment in advanced and simple structure. Drill head is driven with cylinder-chain speed multiplication system, the process of feeding and ascending is more stable and reliable, enable accurately adjustment to the pressuring and de-pressuring drilling. The sliding mast is easy in raise and lowering, stable and reliable in earthing, its upper section can be folded and the rig is convenient for its transport. The mast can be adjusted within the range from 45 to 90 degrees for drilling.